[Bug rtl-optimization/81019] [6/7/8 Regression] wrong code with -O -fno-tree-ccp

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81019

Mikael Pettersson <mikpelinux at gmail dot com> changed:

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                 CC|                            |mikpelinux at gmail dot com

--- Comment #2 from Mikael Pettersson <mikpelinux at gmail dot com> ---
I can reproduce the wrong code.  The testcase passes on trunk since r249850,
but that was only an optimization tweak.  If I back that revision out and apply
Alexandre Oliva's proposed fix for PR80693
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80693#c2) the testcase is again
fixed.  And backporting the proposed PR80693 fix also fixes the testcase on the
gcc-7 and gcc-6 branches.